(1)计算:(2aa-1-1a+1)•a2-1a(2)解分式方程:1x-3=2+x3-x
试题难度:难度:中档试题类型:解答题试题内容:(1)计算:(2aa-1-1a+1)•a2-1a(2)解分式方程:1x-3=2+x3-x...
试题难度:难度:中档 试题类型:解答题 试题内容:(1)计算:(2aa-1-1a+1)•a2-1a (2)解分式方程:1x-3=2+x3-x
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试题答案:(1)解法一:原式=2aa--1•a2-1a-aa+1•a2-1a,
=2aa-1•(a+1)(a-1)a-aa+1•(a+1)(a-1)a,
=2•(a+1)-(a-1),
=2a+2-a+1,
=a+3;
解法二:原式=2a(a+1)-a(a-1)a2-1•a2-1a,
=a2+3aa2-1•a2-1a,
=a2+3aa,
=a+3;
(2)方程两边乘以(x-3),
得:1=2(x-3)-x,
1=2x-6-x,
∴x=7,
检验:将x=7代入原方程,左边=14=右边,
∴x=7是原方程的根.
=2aa-1•(a+1)(a-1)a-aa+1•(a+1)(a-1)a,
=2•(a+1)-(a-1),
=2a+2-a+1,
=a+3;
解法二:原式=2a(a+1)-a(a-1)a2-1•a2-1a,
=a2+3aa2-1•a2-1a,
=a2+3aa,
=a+3;
(2)方程两边乘以(x-3),
得:1=2(x-3)-x,
1=2x-6-x,
∴x=7,
检验:将x=7代入原方程,左边=14=右边,
∴x=7是原方程的根.
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